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Al(PO3)3 coated NCM811 positive electrode material and preparation method thereof

A technology of NCM811 and cathode materials, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of active materials being easily corroded, electrolyte side reactions, etc., and achieve the goal of improving electron transmission capacity, alleviating impedance, and reducing capacity Falling effect

Pending Publication Date: 2021-08-06
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The widely used high-nickel ternary material is LiNi 0.8 co 0.1 mn 0.1 o 2 (commonly known as NCM811), which is very in line with the rapid development of the re-electrification process for the development of high-capacity, high-energy-density batteries, but the material will have side reactions with the electrolyte during the long-term cycle, and the active material is in oxidation. It is susceptible to corrosion in the state, which has a negative impact on the structural stability, cycle performance, and rate performance of the material, and the surface coating of the material can enhance chemical compatibility and improve electrochemical stability.

Method used

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  • Al(PO3)3 coated NCM811 positive electrode material and preparation method thereof
  • Al(PO3)3 coated NCM811 positive electrode material and preparation method thereof
  • Al(PO3)3 coated NCM811 positive electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] The coated NCM811 positive electrode material includes the following specific process steps:

[0030] The number of the high-nickel cathode material used is recorded as NCM811.

[0031] Step (1): According to commercial NCM811 and Al(PO 3 ) 3 The mass ratio is 50:1 to accurately weigh the positive electrode material;

[0032] Step (2): Grind the raw materials weighed in step (1) by dry grinding method, and control the grinding fineness by controlling the grinding time. The grinding time can be appropriately adjusted according to actual needs. When the mixed raw materials are fully mixed evenly and Stop grinding when the fineness is appropriate;

[0033] Step (3): Put the homogeneously mixed sample in step (2) into the sintering furnace, adjust the heating rate program of the sintering furnace to 5°C / min, when the sintering temperature reaches 300°C, keep warm for 5 hour, then take it out after natural cooling to obtain Al(PO 3 ) 3 Doped and coated high-nickel tern...

Embodiment 2

[0035] Except that the sintering temperature was changed to 400°C, the rest of the preparation method was the same as in Example 1, and the prepared sample was designated as ALP400.

Embodiment 3

[0037] Except that the sintering temperature was changed to 500°C, the rest of the preparation method was the same as in Example 1, and the prepared sample was designated as ALP500.

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Abstract

The invention discloses an Al(PO3)3 coated NCM811 positive electrode material and a preparation method thereof. The preparation method concretely comprises the steps that commercial NCM811 and Al(PO3)3 powder is subjected to dry grinding until the particle fineness is moderate and the particle distribution is uniform, sintering is performed at the temperature of 300-500 DEG C, heat preservation is performed for a period of time, then natural cooling is performed, and after the powder is taken out, the high-nickel ternary positive electrode material doped and coated with Al(PO3)3 is obtained. The preparation method has the advantages that the cost of raw materials used in the preparation process is low, the raw materials are easy to obtain, the preparation process is green and environment-friendly, the capacity, the rate capability and the cycling stability of the material can be effectively improved by the NCM811 coated with Al(PO3)3, and the method has very strong production adaptability in industry.

Description

technical field [0001] The invention relates to the field of surface modification of lithium ion batteries, specifically surface coating Al(PO 3 ) 3 LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material. Background technique [0002] People's use of non-renewable resources such as coal, oil, and natural gas has brought great convenience to production and life. Modern industry has also flourished on this basis, but environmental pollution will inevitably be caused during the use of fossil energy. It has become a long-standing problem that plagues the benign and healthy development of society. As an important part of the clean energy field, lithium-ion batteries play a pivotal role in promoting the transformation of energy utilization methods, improving energy utilization efficiency, and welcoming the arrival of a carbon-neutral society. As a secondary battery system, lithium ions are intercalated and extracted between the positive and negative electrodes during charge and discha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 王凤邓文辉王江邓健秋王仲民刘嘉庚周怀营
Owner GUILIN UNIV OF ELECTRONIC TECH
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